The 38-year-old former Aston Villa, Manchester United, Blackburn, Birmingham and Sunderland player will line up for former clubas a guest player when they play the Premier League side on Saturday.
Yorke insists he has no desire to return to competitive football - but is confident he can still hold his own.
He explained: "If I didn't think I could do it and if I didn't think I could give a good account of myself I wouldn't be here.
"I didn't turn up here just for turning up's sake. I'm here to give a good account of myself and that's what I'm hoping for.
"I just want everybody to know I'm not here looking for a new contract or anything, I'm coming here to give my best obviously because I'm competitive like that.
"I'm looking forward to play against a Premier League team and I'm sure all the boys from Sydney as well are looking forward to that, because that opportunity doesn't come along very often.
"It'll just be good to see if I can still compete at that level."
He continued: "Football to me is not that difficult. I'm in pretty good nick in terms of physical fitness.
"Football-wise, obviously I've lacked that. In the next two days we'll monitor that as to how long I'll play in the game - but from a physical point of view I'm in very good touch.
"I just need to get the feel of the ball and I should be okay."
Asked if the lure of Sydney nightlife influenced his decision to return, Yorke said with a smile: "I'm looking forward to that as well."
Yorke, who has balanced a fledgling media career with a role as Ambassador of Sport in Trinidad and Tobago since hanging up his boots, is undecided what his future holds. However, he admits a career in coaching is a strong possibility.
He added: "Once I've settled down a little bit and reflected on which direction I want to go, I'll make that decision.
"But football has been part of my life and it's very difficult to walk away from that.
"Management is something that I feel I can be good at - providing the opportunity is the right one."